| Cinnamomum camphora(L.)Presl.(Cc)is mainly good precious tree species and afforestation tree species in our country,has the very high economic and ornamental value,the current resources has been damaged to a certain extent,it is urgent to strengthen large-scale artificial afforestation and management of Cc,so as to make the Cc ecological,economic and social benefits were coordinated and the sustainable utilization,the density and fertilizer application is plantation cultivation and management in one of the most effective measures.Therefore,different densities(D1:6990 plants/hm2,D2:8325 plants/hm~2,D3:10095plants/hm~2,D4:12495 plants/hm~2)and fertilization configuration(CK(no fertilizer application),force source treasure compound fertilizer NPK≥30%),organic inorganic fertilizer NPK≥15%),organic fertilizer NPK≥5%))of different forest age Cc forest(1 year,2 years and 3 years)as test materials,and Double-factor 4×4 factorial design was adopted,explore its growth characteristics under different combination treatment,as well as for different duration of benefit analysis,and Cc plantation management and benefit evaluation,to promote the development of the native tree species provides technical reference and basis.The main research results of this paper are as follows:(1)The tree height,ground diameter,crown width and height-diameter ratio of Cc were significantly different under different density and fertilization allocation.Among them,smaller density and fertilization could effectively promote the growth of tree height,ground diameter and crown width,but in terms of the aspect ratio,there was no obvious rule in the aspect ratio of Cc trees under different treatment combinations.Choose by the experimental results can be concluded that D2F1 combination(Density of 8325 plants/hm~2,fertilizer varieties can source treasure compound fertilizer),tree height,ground diameter and crown may be of the greatest growth promoting effect,including Cc 1 year,2 years and3 years of maximum tree height 78.01 cm,131.00 cm,144.25 cm,with a maximum diameter 11.60 mm,21.13 mm and 27.87 mm,maximum crown were62.33 cm,99.05 cm,109.10 cm.(2)In this study,the annual growth rate was used to evaluate the annual growth dynamics of Cc height and ground diameter under different densities and fertilization configurations.The research results show that D2F1 combination under the annual highest Cc height,ground diameter,including 1 year,2 years,and Cc trees full growth is 3 years maximum were 50.35 cm,53.16 cm,16.52 cm,annual 7.07 mm in diameter,9.53 mm and 6.93 mm,and tree height and diameter of the years of growth were the highest in the second year.(3)Economic benefits the research results show that the yield of fresh camphor leaves,yield of spices,yield of steaming oil and yield of investment(71.48%)of Cc forest in D2F1 combination production are the highest,the Cc 1year,2 years and 3 years of fresh leaves yield maximum 8.04 t/hm~2,14.51 t/hm~2,16.41 t/hm~2,spices maximum yields were 18989.7 yuan/hm~2,34259.4 yuan/hm~2,38770.7 yuan/hm~2,the maximum yield of steaming oil is 9902.4 yuan/hm~2,20598.2 yuan/hm~2 and 23758.1 yuan/hm~2,respectively.To sum up,this study found that the plantation density of Cc plantation was8,325 plants/hm~2,and the fertilization varieties were planted with compound fertilizers,and the tree growth was relatively high,which could obtain good economic and ecological social benefits,thus providing technical reference and basis for promoting the development of native tree species. |
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